Liquid package with aseptic properties and a method of producing such a package

ABSTRACT

The invention describes a liquids package comprising a tube with side walls at the ends of which there are fitted a flat bottom (3) and a top which incorporates a pourer orifice, the tube consisting of paper and the bottom (3) being so welded to the tube along part of an edge by means of a plastics rim (21) that the flat main area (14) of the bottom (3) is disposed at a distance from the outer cut edge of the tube. So that the package can also be constructed for aseptic purposes and in order to render production simple and economical, it is envisaged that the bottom (3) comprise, separate from the tube, a main area (14) of paper coated with synthetic plastics material, being provided with a metal interlining, like the tube. According to the method of producing such a package, the bottom (3) is so prefabricated that its main area (14) consists of paper provided with a metal interlining, the bottom being cut therefrom and the main area (14) being connected along its marginal surface to a synthetic plastics rim (21) so that the bottom (3) prefabricated in this way can be taken from stock or can be welded on the dividing and edge.

This application is a continuation of application Ser. No. 07/787,815filed Nov. 4, 1991 abandoned, which is a divisional application ofpending prior application Ser. No. 458,139 filed Dec. 28, 1989, now U.S.Pat. No. 5,074,099.

The invention relates to a package for liquids such as silk, juice orthe like, having side walls connected to the tube via a longitudinalsealing seam, a substantially flat bottom and a top incorporating apouring orifice, at least the tube consisting of synthetic plasticscoated paper, cardboard or the like which serves as the carriermaterial, while the bottom is so welded to the tube along at least onepartial edge by (means of a cross-sectionally at least substantiallyL-shaped rim) of synthetic plastics material so that its flat mainsurface is disposed at a distance from the outer edge at the end of thetube.

Furthermore, the invention relates to a method of producing such apackage for liquids, such as milk, juice or the like, having side wallsconnected to the tube via a longitudinal sealing seam and at one end ofwhich there is a top with a pouring orifice connected at least partiallyby integral injection moulding, while at the other end there is a bottomadapted to form a hinge along a part of an outside edge, after which thepackage is filled through the open bottom whereupon the bottom is foldeddown for sealing of the tube and is welded along the remaining part ofthe outer edge.

For flowable media in general and in particular for liquids, there aremany types of disposable package available, the packages which are ofparticular interest being those which have, connected to the tube by alongitudinal sealing seam, side walls which consist of syntheticplastics coated carrier material. In the case in question here, thecarrier material is paper, cardboard or the like, any one of these termsbeing understood as being representative of the others. It goes withoutsaying that a liquids package has a bottom and a top with a pouringdevice. In this respect, there is generally a need for the package to befluid-tight and stable while the pouring device must nevertheless be soprovided that it can be opened without requiring any very greatapplication of force.

In order to satisfy those conditions, a package already exists which haspaper side walls, the bottom and top being injection moulded into place.With an injection moulding machine, it is possible, in fact, to designan embodiment for a pouring device and which is perfectly sealing-tightand which can nevertheless be easily opened. In the case of the priorart embodiment considered here, the top and bottom can be of athermoplastics material, have no backing material, and be easily mouldedonto the end edges of the side walls, because the surfaces of the sidewalls are coated on the inside and outside with a thin layer ofsynthetic plastics material.

In the manufacture of this prior art package, the procedure adopted hasbeen that firstly the side walls are formed from paper and then, bymeans of the longitudinal sealing seam, shaped into a tube, after whichthe top is injection moulded onto an end edge of the tube. In order tobe able to fill this prior art package, it has been envisaged firstly toweld the bottom only along a part of the outer edge of the tube so thatas a result the bottom can be moved like a hinge in relation to thetube. In particular, the bottom is open and the package can thus befilled. After filling, the bottom is folded into the cross-section ofand transversely to the longitudinal axis of the tube and is then weldedalong the inside along the remaining areas of the edge at the end of thetube. The package which is produced in this way is fluid-tight, can bepacked in an outer container, transported, put into store, etc.

Thermoplastics materials like materials in general are not available inany desired quantity nor are they free of charge, so that it goeswithout saying that the manufacturer of the packages seeks to designthin synthetic plastics walls. Just like synthetic plastics coatedpaper, such walls are readily permeable to oxygen so that such a liquidspassage would be no good for aseptic purposes.

On the other hand, packages are already known which, in order to improvethe barrier properties of the package walls, are provided with wallswhich have a metal (interlining).

Packages are known of which the side walls and bottoms are completelyand the top partially made from aluminum coated paper, the bottom beingformed by folding in one end of the tube. Folding in paper which hasbeen coated with aluminium film does, however, have the drawback ofcausing creases and breaks in the aluminium film so that the desiredbattery properties vis-a-vis oxygen are lost once again.

It is the object of the invention, therefore, to provide a liquidspackage of the type mentioned at the outset which is also good foraseptic uses and to make it possible to manufacture such a package by amethod which is technically simple, economically viable and have everyprospect of being successful.

With regard to the liquids package itself, this problem is according tothe invention resolved in that the bottom comprises, separate from thetube, a main surface which consists of paper coated with syntheticplastics and which, like the tube, has a metal interlining. For thefirst time, these measures provide a bottom which consists of metalcoated paper at the bottom end of the tube, the bottom being drawnsomewhat into the tube and being welded in a fluid-tight manner, asynthetic plastics rim being used which is cross-section has preferablytwo flanges which are substantially L-shaped in respect of each other.In the prior art case, the entire bottom consists of thermoplasticsmaterial with no carrier material, so that in that case as well it wouldbe possible to speak of an L-shaped synthetic plastics rim, but onewhich is formed in one piece with the main area of the bottom. In thecase of the liquids package according to the invention, such an integralconstruction is out of the question because the bottom consists of paperwhich carriers a metal coating.

For the rest, it should be pointed out that the cross-section of thetube can be round or polygonal or it may possibly be round at one endand polygonal at the other end, with the result that the bottom and/orthe top may in plan view be of the most widely diverse forms: round,polygonal, particularly circular, triangular, square, rectangular,octagonal, decagonal, dodecagonal or even trapezoidal. It will emergefrom the ensuing description that, according to the invention, thebottom is produced separately and for this reason the metal coating canvery easily be used for producing the bottom so that the package is notonly economically interesting but is also reliable and can above all beused for holding sterile contents.

According to the invention, it is expedient for the top to have at leastpartially a wall panel, the edge of which is connected to a neighbouringwall in a fluid-tight manner by injection moulded bridges of syntheticplastics material. A package comprising a paper tube which has a topbuilt up in this way is indeed already known per se. However, a liquidspackage has three essential parts, namely the tube, the top and thebottom and if just one of these essential parts is made in accordancewith a different concept, then the entire complex of problems inherentin the liquids package changes completely. In actual fact, in the past,one has always adopted to premise that the said bridges of syntheticplastics material can be moulded onto the edges of the neighbouring wallin fluid-tight fashion but requires at least two-part moulding tools forthe purpose, i.e. an outer tool and a mandrel disposed in the interiorof the tube, so that manufacture of the top must always be completelybefore the package is filled. However, if a liquids package is filledand still open at one end, then the measures for closing it are in turnrestricted by the existing material on the one hand and the level ofliquid, including its instability and mobility on the other. For thisreason, the block bottom closure has been regarded as particularlyexpedient and one has been prepared to accept the disadvantageousfolding of the tube material already mentioned at the outset. Accordingto the invention, on the other hand, the tube material is no longerfolded but the bottom which consists of metal coated paper is insertedand welded.

In an advantageous further development of the invention, the flat mainarea of the bottom which consists of paper occupies the entirecross-sectional area of the tube and the at least substantially L-shapedsynthetic plastics rim is welded around the edge of the surface of thebottom and to the inside of the rim at the top of the tube. In otherwords, for practical purposes, the bottom consists just of the flat mainarea, so that its outer cut edge is substantially crosswise to the areaof the tube surrounding it. There are already various possibilities ofattachment using synthetic plastics material, but according to theinvention the said plastics rim with the at least two cross-sectionallyL-shaped flanges is used so that the bottom is disposed at a distancefrom the outer cut edge of the tube and is offset somewhat inwardly.

In the case of sheet metal tins for canned food, there are alreadyavailable drawn-in bottoms, the rims of which are connected insealing-tight manner to the rim of the tube by a flanging-over process.Where paper is the carrier material, however, flanging-over is a processwhich is not suitable for liquids packages of this type. Therefore, thesynthetic plastics rim is used. Drawing in the bottom in relation to theouter cut edge of the tube, when heat-applying jaws are used, alsomating jaws are used to achieve a perfect weld. Furthermore, due to thedeep drawing, the bottom is in a protected position.

The previously explained embodiment therefore represents a bottom, themetal coating of which extends as far as the outer cut edge withoutanywhere being folded, bent or flanged over.

In order to enhance the strength of the anchoring between this bottomand the tube, it is according to the invention further envisaged thatthe part of the synthetic plastics rim which is moulded at the end ofthe tube should be lengthened towards the interior of the tube toprovide an additional overlap of the outer cut edge of the bottom. Abottom which consists of paper with the described coating is generallystamped from a web and the stamping process produces outer cut edgeswhich are exposed with no coating, so that ideally they should not yetcome in contact with any contents. Otherwise, due to capillary action,the contents would penetrate the open edge of the paper, cause it tosoften and result in its destruction. By the aforedescribed lengtheningof the synthetic plastics rim towards the interior of the tube, there isan L-shaped or U-shaped, which means that an additional strip is placedover the exposed edge of the paper so that the bottom which is producedin this way can no longer be destroyed by liquid penetrating the paper.Furthermore, at the critical weld point, adhesive material(thermoplastic) is applied to the synthetic material so that the bottomand tube can be even more effectively anchored. Even oxygen willencounter a thicker barrier.

Furthermore, the invention is characterised in that the part of thesynthetic plastics rim which is provided at the end of the tube foradditional overlap of the outer cut edge of the tube is lengthened andforms at least one L-shaped cross-section with a standing surface.Viewed in the cross-section of the plastics rim, this is an extendedtongue which overlaps the outer cut edge of the tube and therefore itwill subsequently constitute the standing surface when the package iscompleted and filled. In this way, the same synthetic plastics rim whichjoins the bottom to the tube will at the same time also protect theplastics-free and thus endangered outer cut edge of the tube.

According to the invention, it is furthermore advantageous if theplastics rim, of U-shaped cross section and engaging around both sidesof the outer cut edge of the tube, is provided with an outer protectivepanel applied to the standing surface. This embodiment is still furtherimproved, i.e. the plastics rim is, at the location in question,provided with what is in cross-section an even longer tongue than in thecase of the embodiment described hereinabove, so that this longer tonguecan be used not only to form a standing surface but also an outerprotective panel. This plastics panel in fact protects the rim of thetube on the outside and prevents the standing surface which rests onlyon the outer cut edge of the tube, being stripped off when roughlyhandled.

In the case of another preferred embodiment of the invention, it isenvisaged that the flat main area of the bottom which consists of papershould occupy the entire cross-sectional area of the tube and compriseat its outer edge connecting lugs which are articulated via fold lines,being themselves folded transversely out of the plane of the main area,alongside the rim area of the bottom and being welded to the inside ofthe end rim of the tube, the at least substantially L-shaped plasticsrim being welded on the surface around the edge of the bottom and on theouter cut edge of the tube and on the outer cut edge of the bottom. Theembodiment described here differs from that previously described in thatthe main area of the bottom is provided on the outside with connectinglugs so that, viewed in cross-section, the bottom has the form of a Uwith short, free arms, the arms being the connecting lugs which arewelded to the inside of the end rim of the tube. This in itself providesa fluid-tight package, only the plastics-free outer cut edges of theconnecting lugs and of the tube having to be protected. In thisembodiment, it is the plastics rim which provides this protection.

In the case of another advantageously developed embodiment, in fact, theplastics rim, engaging in a U-shape in cross-section around the surfaceof the bottom connecting lugs and the end rim of the tube is providedwith a standing surface and an outer protective panel. At this point, itshould be mentioned that on the prefabricated bottom thecross-sectionally L-shaped synthetic plastics rim may have one flange soextended that its cross-section acquires the shape of a Z, the free armof the Z being regarded as an extended tongue. This then forms thestanding surface and the outer protective panel. The part of the tonguewhich forms the standing surface does, in fact, serve as an edge guard,lying directly on the top of the plastics-free ends of the connectinglugs and tube, the outer protective panel engaging around the outside ofthe tube as already explained in conjunction with the first embodimentwhich was described.

It may furthermore be expedient if, according to the invention, theplastics rim is connected to strengthening webs welded on the outside ofthe bottom. These may, for example, be cruciform or stellate and can besealed onto the surface of the bottom with the further advantage that ifthere is a symmetrical construction in the centre of the strengtheningwebs, preferably of the cross or star, the supply of plastics materialcan take place in the manufacturing machine. As it happens, a manskilled in the art knows that with a central supply of syntheticplastics material, it is always possible to achieve a particularly wellconstructed rim or marginal portion, because the flow paths of the hotliquids thermoplastics material are in this case equally long in everydirection. The design of the entire liquids passage is particularlyadvantageous if, according to the invention, the flat main area of thebottom is square and comprises four elongated connecting lugs. Anotheralternative embodiment is characterised in that the flat main area ofthe bottom ha a circular periphery and comprises a plurality of small,preferably triangular, connecting lugs.

Notwithstanding the actual design of the top or bottom, the packageaccording to the invention can be readily used for transporting orstoring sterile liquids because the side walls, the top and the bottom,can be constructed from materials (paper with a metal coating) whichhave good barrier properties vis-a-vis oxygen. The synthetic plasticsbridges are made sufficiently thick at the edge of the wall panels ofthe top so that a relatively good barrier quality is assured. The bottomand its connection with the tube is described in detail hereinabove,together with the corresponding good barrier properties for oxygen.

The method mentioned at the outset for producing the package is, inorder to resolve the problem, characterised in that the bottom isprefabricated, in fact so that a main area occupying the entirecross-sectional area of the tube is cut from paper or the like providedwith a metal interlining and coated with synthetic plastics material andconnected along its edge surface to an at least substantially L-shapedsynthetic plastics rim and in that the prefabricated bottom is take fromstock or is welded to or injection moulded on the part of the end edgeof the tube when the plastics rim is prepared.

In contrast to the prior art package described at the outset, in whichtop and bottom consist of synthetic plastics material with no carriermaterial and are so mounted on the tube in a single injection mouldingtool that the top is closed and the bottom is left open, the methodaccording to the invention operates with two separate injection mouldingtools. The first is used for making the top. The second, separateinjection moulding tool is used for producing the bottom which, in themanner described above, is first taken from stock in a first stage (oris fitted when the plastics rim is being attached) and is welded to thetube along just one partial edge. Indeed, the effect here, as with theprior art packing, is that the package can be filled from the bottom.However, the bottom is differently constructed and is made fromdifferent materials, so that the known production method cannot be used.The prefabricated bottom is fed to the welding machine or at least themain area of the bottom is prefabricated and is produced together withthe plastics rim in this second separate injection moulding tool, beingthereby welded to an outer part of the edge of the tube.

If one considers the first embodiment described, which has no connectinglugs and in which the flat main area of the bottom occupies the entirecross-sectional area of the tube, then one strip of the plastics rim,i.e. in cross-section one arm of the L which, in fact, projectstransversely from the main area of the bottom, can be regarded as aconnecting part by means of which the flat bottom, which has no lugs, isattached to the inside of the end rim of the tube. In the case of theother embodiment, the second embodiment described, in which the at leastone connecting lug is welded to the inner end rim of the tube, theconnecting lug therefore consists of paper coated with syntheticplastics material and/or metal.

Also in the case of the connecting lugs, according to the teaching ofthis invention, the bottom is first prefabricated, kept in stock andthen welded to the edge of the tube or at least is so prepared that theplastics rim is already partially injection moulded on the connectinglugs and at least one connecting lug is moulded on part of the outeredge of the tube. Furthermore, according to the invention, for thisembodiment the method is characterised in that for prefabricating thebottom the main area with the connecting lugs articulated on its isstamped out, after which the lugs are folded up and the plastics rimhaving an at least L-shaped cross-section is injection moulded on theedge of the surface of the bottom and on the connecting lugs with aprojecting tongue which will subsequently form a standing surface and/orouter protecting panel. If, for instance, the bottom is square, a squarepaper panel coated with metal is cut out, the corners being furthermorebeing so stamped out that the connecting lug are created between thecorners. Suitable grooving provides for fold lines along which theconnecting lugs can be folded transversely out of the plane of the mainarea. During prefabrication of the bottom, therefore, the plastics rimis injection moulded on the connecting lugs and so sets them in thefolded-up position. The bottom kept for example in stock, then has aplastics rim with a tongue projecting outwardly in a plane parallel withthe main area of the bottom and which later will constitute the standingsurface and/or the outer protecting panel.

According to the invention, it is thereby expedient if, for attachmentof the bottom which is preferably prefabricated by a separate injectiontool, firstly at least one connecting lug is fixed to the end rim of thetube on the inside by an induction welding process, whereupon theprojecting tongue of the plastics rim is bent in a U-shape around theconnecting lug of the bottom and the end rim of the tube and is rigidlywelded from the outside. This rigid welding can be an ultra highfrequency welding process or may involve the use of hot shoes, if onedoes not wish to use the effect of the metal coating or if no metalcoating is provided. Naturally, induction welding presupposes thepresence of the metal coating and is preferably used if firstly theconnecting lug is to be fixed to the end rim of the tube, in which casethis is a further inner welding. Heat applying shoes could not conveythe necessary welding heat from the outside all the way to this innerlocation.

Further advantages, features and possible applications of the presentinvention will emerge from the ensuing description of preferredembodiments which are shown in the accompanying drawings, in which:

FIG. 1 is a perspective view of a first embodiment of a packageaccording to the invention, which is of parallelepiped shape;

FIG. 2 shows a second embodiment of a perspectively illustrated packagehaving a square bottom and a round top;

FIG. 3 likewise is a perspective view of another and third embodiment;

FIG. 4 is a perspective cut-away detail from FIG. 3 on an enlargedscale;

FIG. 5 is a cross-sectional view of the bottom edge during the inductionwelding and while the plastics rim is still Z-shaped;

FIG. 6 is another perspective and broken-away detail on the top side ofthe package in FIG. 3, on an enlarged scale;

FIG. 7 is a view similar to that in FIG. 9, but in which the tools areremoved and the tongue of the plastics strip has been folded over andsealed to form the outer protective panel;

FIG. 8 is a plan view of a square bottom with connecting lugs, shown asa prepared blank;

FIG. 9 shows the blank of a circular bottom with triangular connectinglugs;

FIG. 10 is a perspective view of the prefabricated bottom in a squareshape with the substantially Z-shaped plastics rim;

FIG. 11 is a view similar to that in FIG. 10 but broken away and showinga different embodiment with no reinforcing webs;

FIG. 12 is a broken away cross-sectional view taken on the line XII--XIIin FIG. 10;

FIG. 13 is a broken away cross-sectional view through the bottom end rimof the tube with a welded on plastic rim;

FIG. 14 is a view comparable to that in FIG. 12 but showing a differentembodiment, for example according to FIG. 11;

FIG. 15 is a view comparable to that in FIG. 13 but showing a differentembodiment in which the bottom comprises connecting lugs as in FIGS. 11and 14, and

FIG. 16 is a broken away cross-sectional view similar to that in FIG. 13but in which the plastics strip is shown in two different embodiments,L-shaped and Z-shaped.

The liquids package described here comprises a tube 1 having alongitudinal sealing seam 4 by means of which the plastics and metalcoated paper web is formed into a tube 1, during which process the walls5 are formed. At the top, the package is closed by a top 2 while it isclosed at the bottom by a bottom 3. The top 2 is provided with a pourerorifice generally designated 6.

The embodiment shown in FIG. 1 has in plan view a square bottom 3 and asquare top 2, while the embodiment shown in FIG. 2 similarly has asquare bottom but in this case the top 2 is circular. On the other hand,the top 2 of the embodiment in FIG. 3 is trapezoidal or triangular.

While in all three embodiments the bottom is prefabricated separatelyand then welded on, the top 2 according to the embodiment in FIGS. 2 and3 consists of thermoplastics material with no paper or cardboard and iswelded into place together with the handle 7.

In the case of the embodiment shown in FIG. 1, the top is formed by fourfolded over wall panels 8 constructed in one piece with the tube 1. Theedges 9 of these wall panels 8--this is also true of the side walls 5 atthe corner portions (FIG. 6)--are connected to one another in afluid-tight manner by injected bridges 10 of synthetic plasticsmaterial.

What is novel of the package described here, in all its embodiments, isthe construction of the package material which is shown particularlyclearly in FIGS. 12 to 16. The carrier material here is the paper 11,which might also be described as cardboard. One surface, which in mostcases will later be disposed on the outside of the package, carries athin coating of synthetic plastics material 12 while on the other sidewhich will subsequently be in most cases facing the interior of thepackage is more tightly coated with a plastics-encased metal interlining13 (mostly an aluminium foil). This material construction is alreadyknown per se.

Whereas FIGS. 1 to 3 do not very clearly show the bottom 3, this is moreclearly illustrated in FIGS. 5 and 7 to 17 in various embodiments inplan view, perspective view, and in broken away sections. Where thefinished package is concerned, the bottom which is generally designated3 has as flat main area 14 consisting of paper 11 coated with syntheticplastics material 12 and aluminium foil 13 and in FIG. 8 it is shownquadratically within the four inner corners, while in FIG. 9 it iscircular and in the embodiments shown in FIGS. 10 and 11 it isrectangular. In the case of the embodiment shown in FIGS. 1 to 3, theboundary line shown on the right at the front might be considered to bethe dividing edge 15 (which in the case of a circular constructionaccording to FIG. 9 might, for example, be the more thickly indicatedarea shown at the top on the left), along which during the course of theproduction process, when the tube 1 is completed together with the top2, the bottom 3 is disposed so that is projects therefrom is such a waythat the package is open at the bottom and so that it can be filledthrough the bottom. Only after then is the bottom 3 folded down so thatthe main area 14 of the bottom 3 occupies the entire cross-sectionalarea of the tube 1 which, except for the embodiment in FIG. 9, is squareor rectangular in the other embodiments shown here. As with the priorart preserved foods cans, the flat main area 14 of the bottom 3 isoffset inwardly by a distance from the outer end edge or standingsurface. This position in shown in FIGS. 13, 15 and 16, where thedistance in FIG. 15 from the outer cut edge 16 of the tube 1 isdesignated A. The area below the outer cut edge 16 of the tube above theheight A is here referred to as the end rim 17 of the tube 1.

The bottom 3 of all the embodiments shown here is so prefabricated thatthe main area 14 is cut, for example as a square (without connectinglugs 18) from paper 11 provided with a metal interlining 13 and coatedwith synthetic plastics material 12 and which occupies the entirecross-sectional area of the tube 1. Consequently, this main area 14 hasan outer edge 19 which is clearly shown in FIG. 16. After the stampingprocess, this has no plastics coating and is therefore sensitive to anypenetration of liquid. In the case of the embodiments shown in FIGS. 10,12, 13 and 16, a cross-sectionally at least L-shaped synthetic plasticsrim 21 is welded onto the surface 20 of the rim which is above the outercut edge 19 and consists of various portions, as can be best understoodfrom the cross-sectional views in FIGS. 12 to 16.

Under the surface 20 of the rim of the bottom 3, FIGS. 12, 13 and 16show one leg S of the plastics rim 21 of which the second leg 22 isformed to project transversely from the main area 14.

The outer cut edge 19 of the bottom 3 is furthermore overlapped by thissecond leg 22 of the L-shaped plastics rim 21 which extends downwardly,i.e. towards the leg S and thus towards the interior of the package,which it is provided with an extension 23 so that the plastic rim 21 hasan L-shaped cross-section. This is shown in FIG. 16 if one initiallydisregards the broken-line extension of the leg 22 of the plastic rim 21which is shown at the top. In other words, the extension 23 represents,extending beyond the outer cut edge 19 of the bottom, an extension ofthe part 22 of the plastics rim 21 which is further extended by the legS and which is mounted on the end rim 17 of the tube 1. Furthermore,referring to the embodiments in FIGS. 12 and 16, it can be seen herethat in fact this part 22 of the plastics rim 21 which is mounted on theend rim 17 of the tube 1 is for additional overlapping of the outer cutedge 16 of the tube 1 extended outwardly by a standing area 24. Thispart 24 of the plastics rim 21 can be further extended so thatsubsequently it is possible to form an outer protective panel 25. Thesetwo parts, which can be seen in the finished package in the bottom area(standing surface 24 and outer protective panel 25) together form atongue 26 which is shown in FIGS. 10 to 12 and 14.

Another embodiment of the bottom 3 is shown in FIGS. 8 and 9. Here,again, the flat main area 14 of the bottom 3 occupies the entirecross-sectional area of the tube 1, but on its outer edge 27 there arefold lines 27' via which connecting lugs 18 are articulated. It can beseen from the view in FIG. 15 that these connecting lugs 18 are foldedout of the plane of the main area 14 alongside the marginal area 20 ofthe bottom 3 to stand upright (by the height A). This can also be seenin FIG. 14. When fitting the bottom 3 according to FIG. 14 on the endrim 17 of the tube 1, then, the connecting lugs 18 are so welded on thatthe aluminium interlining 13 with its plastics sheath in the lug 18 isfused on the one hand to the interlining 13 with its plastics coatingand on the end rim 17 on the other.

FIG. 15 furthermore shows that the synthetic plastics rim 21 with itsstanding surface 24 in this case not only encloses the outer cut edge 16of the tube 1 in a U-shaped configuration but also the outer cut edge 28of the bottom 3 which cannot here be confused with the outer edge 19 ofthe other embodiment shown in FIG. 12.

It can furthermore be seen in FIG. 10 that the plastics rim 21 isalongside the surface 20 of the rim of the bottom 3 connected towelded-on reinforcing webs 29 which are in this case cruciform indisposition. In the middle of the cross can be seen a small nipple 30which represented the supply of synthetic plastics material duringproduction of the floor. In fact, the plastics rim 21 can be constructedcompletely and particularly well if the supply of plastics material iseffected centrally and if the paths travelled outwardly are always thesame, the reinforcing webs 29 representing these flow paths duringproduction.

We claim:
 1. A package for liquids having side walls (5) connected toform a tube (1) via a longitudinal sealing seam (4), a substantiallyflat bottom (3) and a top (2) comprising a pourer orifice (6), the tube(1) comprising a metal interlining connected to a carrier material, thebottom (3) having at least one partial edge (15) welded to the tube (1)via a cross-sectionally at least substantially L-shaped syntheticplastic rim (21) so that a flat main area (14) is at a distance (A) froman outer end edge (16) of the tube (1), characterized in that the rim(21) is injection molded to the bottom (3) and serves as a permanentconnecting piece between the tube (1) and the bottom (3), which bottom(3) comprises, separate from the tube (1), a main area (14) whichconsists of paper which is coated with synthetic plastic material (12)and is provided with a metal interlining (13), and further comprisesplastic reinforcing webs (29) attached thereto, the reinforcing webs(29) being integrally formed with the rim (21).
 2. A package accordingto claim 1, characterised in that top (2) comprises at least partially awall panel (8) an edge (9) of which is bonded in fluid-tight manner to aneighbouring wall (5) by means of injection moulded bridges (10) ofsynthetic plastics material.
 3. A package according to claim 1 or 2characterised in that the flat main area (14) of the bottom (3) whichconsists of paper occupies the entire cross-sectional area of the tube(1) and in that the at least substantially L-shaped synthetic plasticsrim (21) is welded to the edge of the surface (20) of the bottom (3) andto the inside of an end rim (17) of the tube (1).
 4. A package accordingto claim 3, characterised in that a part (22) of the plastics rim (21)which is moulded on the end rim (17) of the tube (1) is for additionalmasking of an outer cut edge (19) of the bottom (3) extended (23)towards the interior of the tube (1).
 5. A package according to claim 3,characterised in that the part (22) of the plastics rim (21) which ismounted on the end rim (17) of the tube (1) is for additionalover-lapping of the outer cut edge (16) of the tube (1) extended to format least an L-shaped cross-section with a standing surface (24).
 6. Thepackage according to claim 5 characterised in that the syntheticplastics rim (21) which engages in a cross-sectionally U-shaped manneraround the outer cut edge (16) of the tube (1) is provided with an outerprotective panel (25) mounted on the standing surface (24).